Automatic forced-draft regulator.



fNo. 742,123. PATENTED 00T. 20,. 1901's.

. n.5. PARSON.

AUTOMATIC FORCED DRAET'REGULATOR.

APPLIOATION FILED MAYS; 1902. l N0 MODEL. 2 SHEETS-SHEET l.

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No. 742,128. PATENTED OCT. 20, 1903'.y

' H. EL PARSONlv AUTOMATIC 'FORCED DRAFTRBGULATQB;

` APPLICATION FlED MAY 3, 1902.

N0 MODEL.

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Patented October 20, 1.903.

PATENT OFFICE.

yneNRY E. PARSON, or BROOKLYN, NEW'YORK, AssIeNoR, BY MEsNE As\sIGNMENTs, To PARsoN MANUFACTURING COMPANY or NEW YORK, A

CORPORATION or NEW YORK.

AUTOMATIC FORCED-DRAFT REGULATOR.

SPECIFICATION forming part of Letters Patent No. 742,198, dated October20, 1903.

Appleman inea May 3,1902. stanno. 105,810. cromati.)

To @ZZ whom t may concern.:

Be it` known that I, HENRY E. PARsoN, a citizen of the United States ofAmerica, and a resident of Brooklyn, county of Kings,State of New York,have invented certain new and useful Improvements in Automatic Forced-Dratt Regulators, of which the following is a specification.

My invention relates to an automatic dero vice for regulating theintensity of the re used for heating water in a steam-boiler. It is animprovement upon the devices which are the subject-matter of LettersPatent of the United States Nos. 681,456 and 681,457, which have beenissued to me heretofore on the 27th day of August, 1901.

The purpose of the present apparatus is to simplify the devices employedin the patents referred to and to increase the positiveness zo of theiroperations. Y,

In this structure I have dispensed entirely with the rope or Wireconnections and coun.- terbalancing-Weights and perform all thenecessary operations by positive steam or Water pressure through themedium of properly-constructed valves.

In the drawings the same numbers represent the same parts in allfigures. Y

Figure 1 is a part section and part verticalv 3o elevation of myimprovedtire and boiler pressure regulator. Fig. 2 is a detail of thetwo- Way-valve-regulating levers. Fig..3 is aview illustrating thevalves in the position assumed when the steam has reached the desiredpres- 5 sure.

Referring to the drawings, Fig. 1 is the combustion-chamber,in whichthere is mounted a boiler 2. 3 is a bridge-walI, and 4 abanking-platform' constructed in connection with 4o the bridge-wall. 5is a grate-platform constructed in the usual way in whichI constructmygrate-platforms. Thegrateisconstructed of sections ot cast-iron platesprovided with conical holes larger on the lower side and smaller on theupper side of the grate. 6 is a forced-draft tube. 7 is aforced-draftblower. 8is the steam-pipe bywhich the blower is supplied With steam. Itpasses through the Wall of the {ire-chamber and is connected through thevalve 9 with the main steam-pipe 10. The ash- 5o pit 11 is closed and noair isadmit'ted to it except through the forced draft pipe 6. The spaceabove the grate 5 is a combustion-cham- .ber, where the gases producedfrom the ',re

meet' a suitable supply of air coming from the bridge-Wall and areburned. 12 12 are channels in the bridge-wall, through which a part ofthe air entering through the forced-draft pipe 6 is permitted to pass,is heated, and is then admitted into the combustion-chamber in thepresence of the gases ot' combustion from the ire. Thus the iire isregulated both as to the amount of air-supply below the grate and theamount of air-supply above the grate. 13 isa valve-stem, and 14 a valveby which the amount of air to be admitted to the channels'12 may beregulated. The main steamsupply pipe 10, connected with the dome of the`boiler by means of the steam-pipe 15, has branches from its top andlower sides. The top branch 16 is connected to one side of the valve 9,While the steam-pipe 8, which supplies steam to the blower, is connectedto the opposite side of the valve 9. To the top of the valve 9 is.connected a steam-pipe 17, which extends from the valve 9 down to avalve 18. This valve consists of a valve proper, 18a, rotatably mountedin the casing 18, and is provided with a groove 18", designed toregister with the port 17'a and the exhaust-y 8c port 40 to relieve thepressure at the top of the piston of valve 25 when the pressure of steamis lowered. The valve 18a tits the casing 18 loosely at the top to formcommunication between'port 39a andV the port 17` when 35 the steamreaches the predetermined pressure. The valve 9 is shown in verticalsection in Fig. 3. 19 is the valve-casing, havingtwo main openings 20and 21 on opposite sides, 20 connected to the steam-pipe 16, 21connected tothe steam-pipe 8. Atthe top of the valve-casing there is anopening 22, to which is connected the steam-pipe 17. On the side of thecasing. there is an opening 22a, vwhich is connected to exhaust andwhich exhausts Vthe space between the two pistons in the cylseparatesthe inlet 2O from the outlet 21. In the center of the partition 23 thereis a valveseat 24, upon which is seated a valve 25, by which thecommunication between the inlet and the outlet 2l is controlled. On thestem 26 of the valve 25 there are two pistons 27 and 28. The upperportion of the valvecasing 19 is cylindrical and is formed in twodiameters, one larger than the other. The lower one forms a cylinder forthe piston 27. The upper one forms a cylinder for the piston 28. Thepistons 27 and 28 are rigidlysecured upon the stern 26 and movetogether. It will be noticed that the area of the piston 27 is greaterthan the area of the valve 25, and consequently when boiler-pressure isadmitted at inlet 2O and relieved from the cylinder above the pistou 28the piston 27 will be forced up by the steam and the valve will beopened. If, on the contrary, the same boilerpressure which is admittedby inlet 2O is also admitted by inlet 22 it will ll the cylinder inwhich moves the piston 28, and because ofL the greater area of thepiston 28 will force that piston down and with it the piston 27 and thevalve 25 and maintain the valve 25 upon its seat. Pressure is applied tothe top of the larger piston 28 by means of the steamboiler pressureadmitted to the condenser 30 and the train of pipes connecting it to thetop of the casing by the inlet 22; but this train of connection afterpassing the condenser is filled with water formed by condensed steam. Ifthe piston 28 should leak and the space between the pistons becomefilled with Water and there is no exhaust for the water, the motion ofthe largerpiston would be blocked and itwould be impossible to close thevalve 25. Therefore it is thatthe exhaust 22n is provided, so as tocarry off any leakage that may escape into the interspace between thepistons 27 and 28.

Referring to Fig. l, it will be seen that connected to the bottom of themain steam-pipe 10 there is a pipe 29, which connects with the condenser30, which is in its turn connected by a pipe 31 with acylinder32, inwhich there moves a piston (not shown in the drawings) which will beraised or lowered as steam-pressure is admitted to or cut off from thecylinder 32. The piston-rod connected to the piston within the cylinder32 rises through the center of the head of the cylinder. 33 is a leverpivoted at 34 on the head of the cylinder 32 and extending to the leftbeyond a stand 35, on which the cylinder 32 is mounted, and resting onthe upper end of the piston-rod. On the end of the lever is suspended aweight 3G. The lever 33 is slotted at 37, the slot being quite wide. Thevalve heretofore referred to is mounted on the end of the stand 35 andconsists of a rotating two-way valve, moved by the stem, which protrudesaxially through the valve-chest and has upon its end a lever 38, whichis connected by means of 'a turn-nut in the slot 37 with the lever 33and is moved by the lever as it rises and falls.

By reference to Fig. 4 it will be seen that the bolt in the end of thelever 38, which passes through the slot 37 in the lever 33, is of muchless diameter than the slot 37. Hence the lever 33 will be permitted tomove a distance equal to this difference ofdiameter before moving thelever 38 or the valve 18. The lost motion thus provided for plays animportant part in the regulation of the boiler-pressure. If the engineis working hard and drawing heavily on the boiler, the boiler-pressurewill be peroeptibly lessened. With each stroke of the engine there willbe a corresponding change in the conditions affecting the automaticvalve, and the drop of boiler-pressure, if low enough, will actuate themain valve and start the blower. It may be, however, that the rate atwhich steam is being generated by the existing fire is suticient tosupply the demands of the engine in a few seconds and that there is nonecessity for starting the blower. If this be the case, the lever 33will vibrate under the influence of fiuctuation of steam-pressurewithout moving the valve-lever 38 or affecting the Valve, due to thelost motion in the slot 37. If the drain upon the boiler is faster thanthe generation of steam, the vibration of the lever 33 will take placethrough the same are; but the arc will gradually move down and the lever33 will hammer with each vibration upon the bolt in the end of the lever38 until it has moved it far enough to close the valve 18 to steam andopen it to exhaust. Then as the steam-pressure rises the lever 33 willstill vibrate under the engines drain upon the boiler and will firstvibrate withouttouching the bolt of lever 38 and will then hammer uponit until the valve 18 is again opened and the forced draftstopped. Thisoperation of hammering the lever 38 little by little as the levervibrates until the valve 18 is either opened or closed produces mostsatisfactory regulation-much more satisfactory than-the toosuddenopening orclosingof the main valve, and consequent starting or stoppingof the blower.

The steam-pipe 17, which is connected with the top of the main valve 9,enters the side of the valve-chest 18. Into the top of the samevalve-chest enters a branch pipe 3E) from the steam-pipe 31.

40 is a drain-pipe.

The two-way valve 18 is so constructed that in one position of the lever38 a communication will be established between the steampipe 31 and thesteam-pipe 17, and in the other position of the lever 38 thatcommunication will be cut off and a communication established betweenthe steam-pipe 17 and the drain-pipe 40. When the steam-pressure in theboiler rises to a point high enough to cause the piston of the cylinder32 to force its pistou-rod upward beneath the lever 33 and raise thatlever sufficiently to release the arm 38 and the valve 18 and opencommunication between the steam -pipe 31 and the IOO ^ ing the valve 25down upon its seat.

steam-pipe 17, then steam or water will be admitted to the top of thevalve 9 into the cylinder in which moves the piston `28 and the piston28 and valve 25 will be moved downward until the valve meets its seat 24and closes the communication'between the steam -inlet 20 and the steam-pipe 8, the blower of the lforced-draft device will be stopped, and theintensity of the fire checked. With the checking of the intensity of thefire the amount of steam generated will be lowered and the boilerpressure will consequently be lowered, both by reduction of temperatureand-work cast upon the boiler. As soon as the boiler-pressure dropssufficiently to allow the weight 36 to draw the lever 33 downward andturn the arm 38 and the valve 18 to a position where it will cut offsteampressure from the steam-pipe 17 and the top of the valve 9 it willat the same time open communication between the steam-.pipe 17 and thedrain-pipe 40, which will at once drain the steam-pipe 17 of whateversteam or water may be in it and relieve the pressure from the top of thepiston 28, which is hold- Immediately the steam-pressure of the boiler,which is constantly below the piston 2 7, will force that piston up andraise the valve and-again admit steam to the steam-pipe 8 and start theforced-draft blower. It will thus be seen that when the pressure in theboiler reaches the desired degree the forced-draft apparatus will bestopped automatically, and when it falls below that degree the forceddraft will again be started and the tire will be maintained at such adegree of intensity as to constantly keep the boiler-pressure up to adesired level. A

In addition to the regulation of the forceddraft blower it is desirableto regulate the tire to some extent by means of a damper in the chimney.

Referring again to Fig. 1, 4l is the damper, suitably mounted in thechimney upon a shaft 42, which protrudes vthrough the wall of thechimney andhas upon its end a crank 43, to which is connected a rod 44,secured to the end of a lever 45. The lever 45 is pivoted at 46 upon thetop of the boiler and upon theside of a cylinder in which therel is apiston. (Not shown in this drawing.) 47 is the piston-rod, protrudingthrough the head of the cylinder and connected tothe le- Ver 45. 48 is aweight -upon the end of the lever 45. The tendency of the weight 48 isto draw the lever 45 downward and close the damper 41 in the chimney.'The eiiect of the piston-rod 47 and its piston is to hold the lever 45up under boiler-pressure and prevent the closing of the damper 41. 49 isa steam-pipe connected to the steam-pipe 8 beyond the valve 9 and at itsother end to the cylinder 50, in which reciprocates the piston andpiston-rod 47. It will be seen that when the steam is admitted to thesteam-pipe 8 it will also enter the steam-pipe 49, raise thel will drawthe lever 45 down and turn the damper 4l, so as to partially close thechimney-aperture, thus reducing the draft and the fire. This automaticdamper-regulator can be used with or without the forced-draft apparatus.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. In an automatieforced-draft apparatus, the combination of a boiler, acombustionchamber, a grate, a blower, a steampipe supplying steam to theblower, a valve in the steam-pipe, said valve consisting of a valve andvalve-seat, two cylinders, each of different size, and each containing apiston, both pistons connected to and movable with the valve, one pistonoperating to open, and the other piston operating to close the valve,and automatic means for admitting and cutting off steam from the largercylinder, the smaller cylinder being in open communication with thesteam-pipe leading from the boiler, substantially as described..

2. In an automatic forced-draft apparatus, the combination of a boiler,a combustionchamber, a grate, a blower, a steam-pipe supplying steam tothe blower, and connected to the boiler, a valve in the steam-pipe, saidvalve consisting of a valve and seat, and two pistons mounted on thevalve-stem, one piston being larger than the other, and bothreciprocating with the valve, a cylinder for each piston in which it isfitted, and automatic mechanism controlled by boiler-pressure andoperating to control the movement of said valve, substantially asdescribed.

3. In an automatic forced-draft apparatus, the combination of a boiler,afuel-chamber, a grate, a blower, a steam-pipe supplying steam IOO log

IIO

to operate the blower, and connected to the boiler, a valve in thesteam-pipe, consisting of a valve and a valve-seat, and two pistonsmounted on the valve-stem, one of the pis- `tons-being larger than theother, two cylinders in which the pistons fit and reciprocate, each ofwhich is supplied with boiler-pressure, a branch from the mainsteam-pipe, a cylinder, piston and lever operating atwoway valve, thecylinder being supplied with steam by the branch from the mainsteampipe, a two way valve also supplied with steam by the branch fromthe main steampipe,a branch connected to the .two-way valve, and to thelarger of the cylinders of the Valve, and connections from the .two-wayvalve to exhaust.

4. In an automatic forced-draftapparatus the combination of a boilelyafuel-chamber, a grate, a blower, a steam-pipe for operating the blower,a Valve in said steam-pipe, said valve consisting of a valve andvalve-seat, and two ICO pistons mounted on the Valve-stem, one largerthan the other, and each reciprocating in the cylinder in which it fits,each cylinder having a connection to boiler-pressure, a branch from themain steam-pipe between the valve and the boiler, which is connected tothe larger one of the cylinders of the valve, a two-way valvc located inthis branch pipe, and means for opening and closing said valve as theboiler-pressure rises or falls above or below a desired degree.

5. In an automatic forced-draft apparatus, the combination with a boilerand a blower for the fuel-chamber, of a pipe connecting the boiler andblower, a valve in said pipe normally opened by boiler-pressure below apredetermined point, to supply the blower, and means to admitboiler-pressure to the valve to close it when said boiler-pressureexceeds said predetermined point.

6. In an automatic forced-draft apparatus the combination of a boiler, afuel-chamber, a blower,.a pipe supplying steam to the blower, a valve inthe pipe, two cylinders of different sizes, each containing a piston,both pistons connected to the valve, one operating to open, and theother to close it, pipe connections from each cylinder to the boiler,and a valve located in the supply-pipe in the larger of the cylinders,with means for opening or closing said valve operating byboiler-pressure, said means constructed with a calculated amount of lostmotion,whereby it is permitted to move or vibrate through a certainamplitude before aifecting the valve,substantially as described.

7. In an automatic forceddraft apparatus, the combination with a boilerand a blower for the fuel-chamber, of a pipe connecting the boiler andblower, a valve in said pipe normally opened by boiler-pressure below apredetermined point to supply the blower, means to admitboiler-pressure' to the valve to close it when said boiler-pressureexceeds such predetermined point, and means for automaticallycontrolling said latter means.

8. In an automatic forced-draft apparatus, the combination with a boilerand a blower for the fuel-chamber, of a pipe connecting the boiler andblower, a valve in said pipe normally opened by boiler-pressure below apredetermined point to supply the blower, means to admit boiler-pressureto the valve to close it when said boiler-pressure exceeds suchpredetermined point, and means to shunt the valve-closing pressure fromthe valve when the boiler-pressure falls below the predetermined point.

9. In a device for automatically controlling steam-pressure, a boiler, aire-boX, a steam-pressure pipe, a valve in said pipe arranged to beconstantly iiuttered under the iniiuence of the boiler-pressure betweencertain predetermined pressure-points and allowed to close or be forcedopen as the boilerpressure exceeds or falls below such predeterminedpoints.

10. In a device for automatically controlling steam-pressure, a boiler,a Iire-box, a steam-pressure pipe, a valve in said pipe, means to closesaid valve, and means to open the valve, the variations betweenpredetermined points of boiler-pressure constantly af fecting theoperation of each of said means and fluttering the valve, an increase ordecrease of such predetermined boiler-presen re positively opening orpermitting the closing of the valve.

ll. In an automatic steam-pressure controller, the combination with aboiler, and a tire-box, of a steam-pressure pipe, a valve therein, alever arranged to constantly flutter under impulses of thesteam-pressure between predetermined points, and connections between thevalve and lever, to permit a movement of the lever to open or close thevalve as the boiler-pressure exceeds or falls below such predeterminedpoints.

l2. In an automatic steam-pressure controller, the combination with aboiler and a lire-box, of a steam-pressure pipe, a valve therein, alever formed with a slot, said lever being constantly luttered byimpulses of the steam-pressure between predetermined points, a valve-armfor moving the valve, and a pin projecting from the arm and looselyseated in the slot in the lever, whereby the fluttering lever mayconstantly move the valve, the effective movement being in one or twodirections according as the pressure exceeds or falls below suchpredetermined points.

13. In an automatic forced-draft apparatus, the combination with aboiler and a blower for the fuel-chamber, of a pipe connecting theboiler and blower, a valve therein admitting power to the blower andopened by a predetermined boiler-pressure, means for admittingboiler-pressure to the valve to close it when said pressure exceeds suchpredetermined point, and means automatically controlled byboiler-pressure for shunting the valve-closing pressure when theboiler-pressure has fallen below such predetermined point.

- la. In an automatic forced-draftapparatus, the combination with aboiler and a blower for the fuel-chamber, of a pipe connecting theboiler and blower, a valve therein admitting power to the blower andopened by a predetermined boiler-pressure, means to admit theboiler-pressure to close the valve when the boiler-pressure exceeds thepredetermined point, and means automatically controlled by definitepoints of boiler-pressure for regulating the valve-closing pressure.

l5. In an automatic forced-draft apparatus, the combination with aboiler' and a blower for the fuel-chamber, of a pipe connecting theboiler and blower, a valve therein admitting power to the blower andopened by a prede termined boiler-pressure, a regulator for admittingthe boiler-pressure when above the predetermined point to close thevalve, and means for controlling said regulator.

IOO

IIO

16. In an automatic forced-draft apparatus, the combination with aboiler and a blower for the fuel-chamber, of a pipe connecting theboiler and blower, a valve therein admitting power to the blower andopened by a predetermined boiler-pressure, a regulator for admittingboiler-pressure to the valve to close it when the pressure exceeds suchpredetermined point, and means controlled by predel termined points ofboiler-pressure for governing the regulator.

17. In an automatic forced-draft apparatus, the combination with aboiler and a blower for the fuel-chamber, of a pipe connecting theboiler and blower, a valve therein admitting power to the blower andopened by a predetermined boiler-pressure, a regulator for admittingboiler-pressure to the valve to close it when the pressure exceeds suchpredetermined point, said regulatorl comprising a valve constantlyuttered between predetermined pressure-points and `fully opened orclosed at pressure-points above or below such predeterminedpressure-points only.

18. In an automatic forced-draft apparatus, the combination with aboiler and a blower for the fuel-chamber` of a pipe connecting theboiler and blower, a valve therein admitting power to the blower andopened by a prede- Itermined boiler-pressure, a regulator for admittingboiler-pressure to the valve to close it when the pressure exceeds such.predeter-` mined point, said regulator comprising'a valve, a leverconstantly iluttered betweeny valve, a slotted lever constantly ntteredbetween predetermined points of boiler-pressure, a valve-arm for movingthe valve, and a pin projecting from the arm and loosely enteringtheslot in the lever, said lever being moved to operate the valve when thepressure exceeds or falls below suchpredetermined points.

Signed by me at New York, N. Y., this 5th day of March, 1902.

HENRY. E. PARSON.

Witnesses:

FRANCIS M. PHRLPS, SIDNEY R. PERRY.

